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I can't hear with all the screaming going on around here!
I have a VV-81 cam in my PV's motor. It's a screamer. In my car (installed straight up, no offset keys) it starts to come onto the cam at roughly 3300 rpm. Then it pulls hard up to at least 7000, high as I dare rev my stock bottom end. This is with DCOE 40's, roller rockers (higher ratio and thus lift), a 4:1 header and 2.25" free flowing exhaust, and an R-sport head with port work, double valve springs, and big valves. I dare say that without a comprehensive set of supporting mods, that cam would make your engine slower. It's tuned for high rpms, and the stock intake, head, and exhaust simply can't operate well at that rpm, so you'd hurt power where a stock motor can make it, and optimize power where the stock motor can't. But with the mods (and you really can't skip any of the I/H/E trinity) it screams.
Personally, I think there probably are better cams out there. The VV-81 is a really 'vintage' sort of performance cam. Over the last decade or two, mankind has learned a bit more about cam shapes, I think some more modern designs might work better, more power at low rpms with no tradeoff at high rpms. John Parker sells some more modern designs, as does KGTrimning (I was all set to get a KG19, but they were out when I was buying parts and I didn't want to wait for months for a cam). But the Isky is priced cheaper than those things. And a peaky cam at least feels neat.
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'63 PV544 rat rod, '93 Classic #1141 245 +t
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